Jacquard feeding mechanism



Nov. 2, 1937. E. R. HOLMES JACQUARD FEEDING MECHANISM Filed Dec. 2l, 1936 Patented Nv.2, 1937 i i v2,097,665

UNITED STATES PATENT OFFICE JACQUARD `FEEDING MECHANI'SM Elbridge R. Holmes, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts .Application December 21, 1936, Serial No. V116,973

claims. (c1. 139-329) This invention relates to Jacquard mechanisms The construction thus far described Vis the as used in looms for Weaving figured fabrics, and usual commercial structure and in itself forms relates more particularly to devices for intermitno part of my present invention, which relates to tently advancing the cylinder by which the patan improved devicefor intermittently advancing 5 tern cards are presented to the Jacquard neethe cylinder I0 anti-clockwise or in the direction 5 dles. These cylinders Vare commonly square in of the arrow b in Figs. 1 to 3. cross section and are shifted alternately toward It has been customary to provide a pull-over or and 'away from the needles. During the outfeed pawl in the form of a simple hook which ward shifting movement, the cylinder is given a Would ride over the outermost upper stud, as I5a l0 'quarterturn to advance the next pattern card to when the cylinder moved toward the needles I2, l0

operative position, and for this purpose studs but which would be engaged by the stud I5a are commonly provided in one end of the cylinas the cylinder was thereafter moved away from der, which studs successively engage a coacting the needles. The pull-over pawl would then adpull-Over or feed pawl during successive outward Vance the cylinder in an anti-clockwise direction Yl5 movements of the cylinder. one-fourth of a revolutonduring each outward l5 It is the object of my invention to improve the 0r inoperative movement of the cylinder. construction of the feed device in such manner During the first half of this outward movethat the cylinder may be at all times under posiment, the hammer I8 would be raised by the stud tive control, and that free and too rapid forward I5a against the force of gravity or spring presmovement of the cylinder will lbe prevented. sure which held the hammer in engagement with 30 My invention further relates to arrangements the studs. After the stud I5 passed its upperand combinations of parts which will be hereinmost position, as 'shown in Fig. 2, the pressure after described and more particularly pointed of the hammer I8, would complete the angular out in the appended claims. advance of the cylinder at a rapidly accelerat- A preferred form of the invention is shown in ing speed until the hammer engaged the stud 25 the drawing, in which I5b, when the angular movement would be sud- Fig. 1 is a side elevation of parts of a Jacquard denly stopped. mechanism, including the cylinder and feeding This sudden stopping of the cylinder has been devices; found objectionable, as a chain of pattern cards Figs. 2 and 3 are side elevations similar to Fig. may be of considerable weight and this weight'i's 30 1 but showing the parts in different successive sustained entirely by the cords which connect adpositions; and jacent cards. The rapid acceleration and subse- Fig. 4 is a partial plan view, looking in the diquent sudden stopping of the cylinder weakens rection of the arrow 4 in Fig. 1. the cord suspension and shortens the useful life Referring to the drawing, I have shown a Jacof the pattern card chain. 35 quard cylinder I0 rotatable on a bearing shaft or In order to prevent this undesirable acceleragudgeons II and adapted to present successive tion and sudden stopping of the cylinder, I have pattern cards C to the Jacquard needles I2 provided the improved pull-over or feed pawl which are mounted in the usual manner in a shown in the drawing, which comprises a pawl needle board I4. The usual operating mecha- 20 having a latch 2l pivoted on a stud 22 in the 40 nism (not shown) is provided for shifting the outer end thereof. An offset lug 23 (Fig. 4) of cylinder I0 away from the needles I2 in the dithe latch 2I cverlies the pawl 20 and limits downrection of the arr'ow a, and for thereafter givward movement of the latch, while permitting ing the cylinder an operative return movement. free upward swinging movement thereof. The

The cylinder I0 is commonly, of square cross pawl 20 is mounted on a fixed pivot 25 and nor- 45 section and is preferably provided with studs I5, mally rests on a stop pin 26. I 5e, I5b, and I5, one in each corner of the cylin- As the pattern cylinder I0 moves toward the der, at one end thereof. A presser foot or spring position shown in Fig. l and in a direction oppohammer I8 is mounted above the cylinder studs site `to the arrow a in Fig. 1, the latch 2l is` lifted and normally yieldingly engages the two upper idly above the stud I5 until it clears the stud, f

studs and maintains the cylinder in one of its whereupon it drops to the position shown in Fig. l. operative positions, as shown in Fig. 1. The As the pattern cylinder is thereafter shifted to hammer I8 is mounted to shift laterally with the the right in Fig. 1, the uppermost outer stud Ia cylinder I0, as the cylinder is moved toward or is engaged by the latch 2I, and the cylinder I0 is away from the needles I2. rotated to the position shown in Fig. 2, at the 55 .ma n

same time lifting'the hammer IB as previously described.

A shoulder 21 is provided on the pawl 20, which shoulder is spaced from the vertical face of the latch 2| suiiiciently to admit the stud l5a but with only slight clearance. As the cylinder I continues tomove outward, the turning movement is continued as indicated in Fig. 3, but rapid acceleration -of the cylinder by the hammer I8 is prevented by engagement of the stud I5a with the shoulder 21. The stud 15e does lnot clear the shoulder 21 until the angular movement of the cylinder has been so far completed that no objectionable acceleration or over-abrupt stopping Will thereafter occur. The angular motio-n of the cylinder is thus positively controlled and the strains on the pattern card chain are substantially reduced or eliminated.

The stop pin 26 holds the pawl 2l in such a position that the cylinder studs are clear of the pawl when the cylinder is in operative position.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set yforth in the claims, but what I claim is:-

1. In a Jacquard mechanism, a pattern card cylinder, yielding `means to hold said cylinder in operative position, means to give said cylinder periodical angular advance movements, said latter means having an associated device effective to prevent free angular advance movementof said cylinder by said yielding means during a major part of each advance movement.

2. Ina Jacquard mechanism, a pattern card cylinder, yielding means to hold said cylinder in operative position, means to give said cylinder periodical angular advance movements, and

'means to prevent free angular forward move- .ment of said cylinder by said yielding means during a major part of each advance movement, but said latter means releasing said cylinder for control by said yielding means as said advance movement is nearly completed.

3. In a Jacquard mechanism having a pattern card cylinder with end studs, a feeding device for Said cylinder comprising a pull-over pawl and a latch pivotally mounted on said pawl for free upward swinging movement from operative position, said pawl and latch having stud-engaging surfaces spaced apart to receive one of said cylinder studs with slight lateral clearance and thereby preventing free angular movement of said cylinder relative to said pawl and latch during V a major part of each advance movement of said cylinder.

4. In a Jacquard mechanism having a pattern card cylinder with end studs, a feeding device for said cylinder comprising a pull-over pawl, a latch pivotally mounted on said pawl for free upward swinging movement from operative position, and means to limit downward movement of said latch relative to said pawl, said pawl and latch having stud-engaging surfaces spaced apart to receive one of said cylinder studs with slight lateral clearance and thereby preventing free angular movement of said cylinder relative to said pawl and latch during a major part of each advance movement of said cylinder.

5. In a Jacquard mechanism having a pattern card cylinder with end studs, a feeding device for said cylinder comprising a pull-over pawl and a latch pivotally mounted on said pawl for free upward swinging movement from operative position, said pawl and latch having stud-engaging surfaces spaced apart to receive one of said cylinder studs with slight lateral clearance and thereby preventing free angular movement of said cylinder relative to said pawl and latch during a major part of each advance movement of said cylinder, and a stop to hold said pawl with its stud-engaging surface above the normal position of the upper cylinder studs during nal inward operative movement of said cylinder.

ELBRIDGE R. HOLMES. 

